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Biology
In vivo Détection de perméabilité vasculaire dans la glande sous-maxillaire de souris
In vivo Détection de perméabilité vasculaire dans la glande sous-maxillaire de souris
JoVE Journal
Biology
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JoVE Journal Biology
In Vivo Vascular Permeability Detection in Mouse Submandibular Gland

In vivo Détection de perméabilité vasculaire dans la glande sous-maxillaire de souris

Full Text
2,535 Views
07:10 min
August 4, 2022

DOI: 10.3791/64167-v

Xiangdi Mao1, Sainan Min2, Qihua He3, Xin Cong1

1Department of Physiology and Pathophysiology, Peking University School of Basic Medical Sciences, Key Laboratory of Molecular Cardiovascular Sciences,Ministry of Education, and Beijing Key Laboratory of Cardiovascular Receptors Research, 2Department of Oral and Maxillofacial Surgery,Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Reseah Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, 3State Key Laboratory of Natural and Biomimetic Drugs,Peking University

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Please note that some of the translations on this page are AI generated. Click here for the English version.

Overview

This study evaluates the endothelial barrier function of the submandibular gland (SMG) using in vivo imaging techniques. Fluorescent tracers of varying molecular weights were injected into test animal models, demonstrating how molecular permeability can be assessed using two-photon laser scanning microscopy.

Key Study Components

Research Area

  • Endothelial barrier function
  • Vascular permeability studies
  • Fluorescent tracer application

Background

  • Importance of tight junctions in endothelial cells
  • Non-invasive imaging methods for tissue analysis
  • The role of submandibular glands in vascular studies

Methods Used

  • In vivo paracellular permeability detection
  • Mouse submandibular glands
  • Two-photon laser scanning microscopy

Main Results

  • Demonstrated varying leakage of fluorescent tracers based on molecular weight
  • Identified disruptions in endothelial barrier integrity due to duct ligation
  • Validated findings through fluorescence intensity quantification

Conclusions

  • The method provides insights into endothelial barrier function in tissues
  • Enhances understanding of vascular permeability related to physiological and pathological conditions

Frequently Asked Questions

What is the purpose of using different molecular weight tracers?
Using tracers of different molecular weights allows for assessing the permeability of tight junctions in endothelial cells.
How does two-photon laser scanning microscopy improve imaging?
This method enables deeper tissue imaging with less scattering compared to conventional techniques, providing clearer images.
What effects were observed when duct ligation was performed?
Duct ligation increased permeability, allowing larger molecular tracers to leak out, indicating a disruption in the endothelial barrier.
Why is proper SMG isolation critical in this protocol?
Careful isolation is essential to minimize artifacts and ensure accurate imaging and permeability assessments.
What are the applications of this imaging technique?
This technique can be applied to study vascular diseases, drug delivery systems, and tissue engineering.
What does the study reveal about vascular permeability in the SMG?
The findings provide a new understanding of how the SMG's endothelial barrier behaves under physiological challenges.

Dans le présent protocole, la fonction de barrière endothéliale de la glande sous-maxillaire (SMG) a été évaluée en injectant différents traceurs fluorescents pondérés moléculairement dans les veines angulaires de modèles animaux testés in vivo sous un microscope à balayage laser à deux photons.

Le présent protocole décrit une mesure de détection de perméabilité paracellulaire in vivo pour évaluer la fonction des jonctions endothéliales serrées dans les glandes sous-maxillaires de souris. Néanmoins, la microscopie à balayage laser à deux photons présente non seulement l’avantage de la microscopie confocale conventionnelle, mais peut également être utilisée pour détecter plus clairement les tissus et les images plus profonds. Cette expérience fournit une bonne mesure méthodologique pour évaluer la perméabilité vasculaire de différents tissus, en particulier les tissus de surface et les organes des animaux.

Commencez par choisir des traceurs appropriés tels que la fluorescéine, l’isothiocyanate, le dextrane marqué et la rhodamine B, le dextrane marqué avec des spectres d’émissions d’excitation distincts, afin de minimiser l’interférence entre les signaux de fluorescence pour le test de perméabilité. Diluer les traces dans une solution saline tamponnée au phosphate stérile en 100 milligrammes par millilitre et stocker les aliquotes à l’abri de la lumière à moins 20 degrés Celsius. Après avoir anesthésié la souris mâle de type sauvage âgée de 8 à 10 semaines, tenez doucement la tête et le cou de la souris pour faire légèrement saillir un côté du globe oculaire.

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